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<h1>set_deviat</h1>
<p>Returns the <em>deviat</em>ion of a set. Two types of <em>deviat</em>ion are supported. These are:</p>
<ul>
  <li>normal</li>
  <li>corigated </li>
</ul>
<h2>parameters:</h2>
<ol>
  <li>A set's name</li>
  <li>a deviation type (see above) </li>
</ol>
